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We’re looking for a Senior Backend Developer to join our engineering team and help design, build, and scale robust server-side systems and data pipelines. You’ll work primarily with Kotlin and Spring WebFlux in a highly concurrent, event-driven environment processing millions of operations per day. This is a core role with real ownership: you’ll help shape architecture decisions, performance strategy, and system reliability in a production-grade fintech platform.
Job Responsibility:
Design and implement server-side services using Kotlin, Java, and Spring WebFlux
Build and maintain fault-tolerant, high-throughput data pipelines
Develop and maintain high-performance APIs
Collaborate closely with frontend engineers to integrate user-facing features
Contribute to PostgreSQL schema design and optimization
Improve system throughput and reliability through profiling, tuning, and performance testing
Scale services horizontally in a cloud-native environment
Integrate performance and reliability checks into CI pipelines
Participate in weekly standups, code reviews, and architectural discussions
Requirements:
Strong proficiency in Kotlin and/or Java
Solid experience with Kotlin coroutines and flows
Deep understanding of Spring WebFlux, Reactive Streams, and backpressure
Experience building distributed, fault-tolerant systems
Strong problem-solving and analytical skills
Comfortable working asynchronously across time zones
Excellent communication skills (Slack, Loom, async collaboration)
Hands-on experience with: PostgreSQL
AWS and cloud-native architectures
Docker and Kubernetes
Strong grasp of the testing pyramid (unit, integration, E2E)
Willingness to actively participate in code reviews and technical discussions